/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.datastax.driver.stress;

import java.util.Iterator;

import com.datastax.driver.core.*;
import com.datastax.driver.core.exceptions.*;

import joptsimple.OptionParser;
import joptsimple.OptionSet;

public abstract class QueryGenerator implements Iterator<QueryGenerator.Request> {

    protected final int iterations;

    protected QueryGenerator(int iterations) {
        this.iterations = iterations;
    }

    public abstract int currentIteration();

    public int totalIterations() {
        return iterations;
    }

    public interface Builder {
        public String name();
        public OptionParser addOptions(OptionParser parser);
        public void prepare(OptionSet options, Session session);
        public QueryGenerator create(int id, int iterations, OptionSet options, Session session);
    }

    public interface Request {

        public ResultSet execute(Session session);

        public ResultSetFuture executeAsync(Session session);

        public static class SimpleQuery implements Request {

            private final Query query;

            public SimpleQuery(Query query) {
                this.query = query;
            }

            public ResultSet execute(Session session) {
                return session.execute(query);
            }

            public ResultSetFuture executeAsync(Session session) {
                return session.executeAsync(query);
            }
        }

        public static class PreparedQuery implements Request {

            private final BoundStatement query;

            public PreparedQuery(BoundStatement query) {
                this.query = query;
            }

            public ResultSet execute(Session session) {
                return session.execute(query);
            }

            public ResultSetFuture executeAsync(Session session) {
                return session.executeAsync(query);
            }
        }
    }
}
